The American Institute for Graphic Arts (AIGA) offers 50 ‘symbols signs’ for pedestrians and passengers for download. They were produced in the nineteen seventies by a collaboration between the U.S Department of Transportation (DOT) and AIGA. Because of their high quality and their government ‘approval’ they are used by many organisations. http://www.designwritings.com/tag/pictogram/#.WJsF6BDOhpY
The U.S. DOT standard for pedestrians/passengers
